Automatic focusing apparatus and automatic focusing method...

Details Automatic focusing apparatus and automatic focusing method... Automatic focusing apparatus and automatic focusing method...

2007-01-09

2007-01-09

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C348S349000

Reexamination Certificate

active

11057688

ABSTRACT:
An automatic focusing apparatus includes a photographing unit for photographing a transmitted light generated by applying a light to an observation target from a light source and an index value operation unit for operating to obtain an index value indicating focus information for the observation target from the image data outputted from the photographing unit. The automatic focusing apparatus also includes a focus controller for controlling a focus of the photographing unit so as to obtain an optimal focus position for the observation target on the basis of the index value, and uses a threshold value obtained from a background color of the image data to discriminate between the observation target and dust, thereby enabling proper automatic focusing on the target to observed even from the image data having the observation target and dust mixed.

REFERENCES:
patent: 4471305 (1984-09-01), Crooks et al.
patent: 6525763 (2003-02-01), Maeda
patent: 10-042184 (1998-02-01), None
patent: 2001-154269 (2001-06-01), None

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